/* Custom CSS for styling beyond Bootstrap */
        body {
            font-family: 'Inter', sans-serif;
            background: linear-gradient(to bottom right, #6b46c1, #5a67d8); /* Purple to Indigo gradient */
            min-height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 20px;
        }
        .card {
            border-radius: 1.5rem; /* More rounded corners */
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2); /* Deeper shadow */
            transition: transform 0.3s ease-in-out;
        }
        .card:hover {
            transform: translateY(-5px); /* Slight lift on hover */
        }
        .form-label {
            font-weight: 600; /* Semi-bold labels */
            color: #4a5568; /* Darker gray for labels */
        }
        .form-control, .form-select {
            border-radius: 0.75rem; /* Rounded input fields */
            padding: 0.75rem 1rem; /* More padding */
            border: 1px solid #cbd5e0; /* Lighter border */
            transition: border-color 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
        }
        .form-control:focus, .form-select:focus {
            border-color: #805ad5; /* Purple border on focus */
            box-shadow: 0 0 0 0.25rem rgba(128, 90, 213, 0.25); /* Purple shadow on focus */
        }
        .btn-primary {
            background-color: #805ad5; /* Custom purple for button */
            border-color: #805ad5;
            padding: 0.75rem 1.5rem; /* Larger button */
            border-radius: 0.75rem;
            font-weight: 700; /* Bold text */
            transition: background-color 0.3s ease-in-out, transform 0.2s ease-in-out, box-shadow 0.2s ease-in-out;
        }
        .btn-primary:hover {
            background-color: #6b46c1; /* Darker purple on hover */
            border-color: #6b46c1;
            transform: translateY(-2px);
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.15);
        }
        .btn-primary:focus {
            box-shadow: 0 0 0 0.25rem rgba(128, 90, 213, 0.5);
        }
        .spinner-border {
            width: 1.5rem;
            height: 1.5rem;
            margin-right: 0.5rem;
        }
        .alert-message {
            margin-top: 1rem;
            padding: 0.75rem 1.25rem;
            border-radius: 0.75rem;
            font-weight: 500;
        }
        .copy-button {
            position: absolute;
            top: 10px;
            right: 10px;
            background-color: #a78bfa; /* Lighter purple */
            border: none;
            padding: 8px 12px;
            border-radius: 0.5rem;
            color: white;
            transition: background-color 0.2s ease-in-out;
        }
        .copy-button:hover {
            background-color: #8b5cf6; /* Darker on hover */
        }
        .copy-message {
            position: absolute;
            top: -30px;
            right: 10px;
            background-color: #28a745; /* Green for success */
            color: white;
            padding: 5px 10px;
            border-radius: 5px;
            font-size: 0.8rem;
            white-space: nowrap;
            opacity: 0;
            animation: fadeInOut 2s forwards;
        }

        @keyframes fadeInOut {
            0% { opacity: 0; transform: translateY(10px); }
            20% { opacity: 1; transform: translateY(0); }
            80% { opacity: 1; transform: translateY(0); }
            100% { opacity: 0; transform: translateY(-10px); }
        }

        /* Responsive adjustments */
        @media (max-width: 768px) {
            .card {
                padding: 1.5rem;
            }
            .h1 {
                font-size: 2.5rem;
            }
        }